Piston head for pumps



c. E. McGee AND T. M. KENT.

PISTON HEAD FOR PUMPS.

APPLTCATloN man TUNE To. T920.

Patented Apr. 4, 1922.

T veNToRs CL, 5. Maz,

ATTORNEY WITNESS @ff/AC Uniti-in stares @ATENT OFFCE.L

antennes Moena, or saura nomen, nivo :maar ivi. KENT, or Los ANGELES,onrirronnrn.

'rrsron nnen ron rui/Irs.

ToaZZ 107mm t may concern:

Be `it known that we` Ciment-i i and Timur ML Kann citizens ot the`United States. residing` at Santa hic/nica, county ot Los ngeles Stateot California, and lios l-lnpgeles,V county et lios Angeles. State ot'California; have invented a new and useiul Improvement in Piston Headstor lumpsj j t illustrative purposes only,

ot which. the 'tollowii e a specification.

My invention relates to litt pumps such as those commonly used in oilwells in .vhich i .the pump is placed near the bottom the oiil tubing,being operated 'from a beam in the i derrick by means ot a line otsucker rods passing downwardly through the ti'ibino.

Such pumps commonly consistentia u'f'orlH ing barrel in which a pistonis reciprocatei'l. Such pumps especially where some sand is found inthewell ditlicult to lreep tight, the working barrel; and piston rapidlywearg ing. It` is lanexpensive and troul)lesoine matter to remove suchpumps 'for repair' especially where the 'working barrel must be removedas this involves pulling the tubing; trom the well. c

.t is common practice at the present time to construct said pun'ips witha limp; piston which is made an accurate in the working barrel, nopiston rings or packing.; being used7 the eiiciency ot the pumpdependingl solely on the accuracy ot the tit between the lont,ycylindrical plunger and the working` barrel in which it is reciprocated.Such pumps are very etlicient when new but once the accuracy ot this isimpairefh the pumps deteriorate i'ery rapidly and the pis* tons andlinings ot 'the working barrels must be replaced. rlhis is expensive notonly on account oit the cost ot' the new parts but also on account otthe expense et removingthe pump from the well. and the loss in oilproduction during the time required for this removal and replacement.

lt is an object ot our invent-ion to provide an oil well pump which isprovided with flexible packing which is carried on the piston and whichmay be tightened up from time to time to compensate :ti i wear.

lt is a 'further object oit our inio tion to provide a structure inwhich the packing may be tightened up without removing' any parts fromthe well.

lt is a further object ot our invention to provide a pump having suchflexible packing in which the packing; may be earned in an Specificationof Letters Patent.y

the standing` `valve seat 28.

1792.0.- sernu No. 388,028.

Aunexpanded condition on the piston so that made evident hereinafter.

. the :term ot' my invention illustrated in ythese drawings, 2l is theworking barrelot the pump which is'threaded at its upper end torattachment to the tubing, not' shown.

Threaded on 'the-lower, end of the working` barrel 2l isA a coupling`orworking` barrel shoe 29" which provides a tapered seat for Resting ona seat ring 2Tl carried inthe seat 2S` is the standiim` valve ball 26which is placed inside a cage 22 which is threaded to the member 28.rllhreaded in the cage 22 is a garbntt rod 19 which may be square andprovided' with oil grooves 19 as shown in Fig. 3.

The rod 19 passes through a square hole in a piston follower 2 which isof such size that the rod 19 and the piston follower turn togetheralthough the piston follower can freely slide vertically on said rod.The piston follower 2 is threaded in a piston 6. Nuts 5 and 3 are placedon the follower 2 as shown in Fig. l and elastic packing l is compressedtherebetween whenever the follower 2 and the piston 6 are screwedtogether. The rod 19 extends through the piston 6 into a tube 20 withoutengaging either so that the piston 3 and the tube 20 can turn freelyabout the rod 19. A nut 18 on the top of 7the rod 19 isa however, otsuch size that it Patented Apr. 4, 1922.

stem 13 of the follower 2 but only slightly compressed, the piston 6with the standing valve, and its parts, dependent therefrom on the rod19 is lowered into the well, the standing Valve seat dropping into themember 29. The piston 6 can now be reciprocated by the pump rods 17. Ifthe packing 4 is too loose, the pump rods 17 are turned, thus turningthe piston 6. The follower 2 being held from rotation by the rod 19 isscrewed up into the `piston 6, thus compressing and expanding thepacking 4. Whenever the packing 4 wears, it can again be expanded byturning thmpump rods 17. y

e claim as our invention:

` 1. In a pump, the combination of: a cylinder; `a piston sliding insaid cylinder; a follower threaded to said piston; packing carriedbetween said piston and said follow- ,y er and expanded thereby;constantly :en- 'gaged means for preventing the rotation of saidfollower in said cylinder; and means for rotating said piston in saidcylinder.

2. In a pump, the combination of: a cyl 1index" la piston sliding insaid cylinder; a

follower threaded tol said .piston; packing have hereunto `subscribedour names this 8th carriedfbetween |`said piston `and said fol# vi.loj'wer and expanded thereby; constantly eny ua" ed means forpreventing the rotation of said follower in said cylinder; and an op-"rating rodsecured to said piston and suited toi'ecipr'ocate and rotatesame. Y

3. In an oil'well pump, the combination of:` a working barrel; a pistonsliding in said barrel; a follower threaded in saidpston; packingexpanded by said follower and said piston; a standing valve structure; agarbutt rod attached to said standing valve structure and engaging saidfollower and preventing the rotation thereof; and pump rods by whichsaidpiston may be rotated.

4. In an oil well pump, the combination of: a working barrel; a .pistonsliding in said barrel; a follower threaded in said piston; packingexpanded by said .follower and said piston; a standing valve structure;a garbutt rod attached to said standing valve structure and engagingsaid `follower and preventing the rotation thereof; and pump rodsrigidly secured to said piston.

5. In an oil well pump, the combination of: a working barrel; a pistonsliding in said barrel; a follower threaded in said piston;

piston; constantly engaged means for preventing the rotation of saidfollower in said working barrel; and pump rods 'rigidly secured to saidpiston. Y

In witness that we claim the foregoing, "we

day of May, 1920,

' CHARLES JERRY M. KENT. Witnesses:

S. W. BARTON, RUTH F. BURKE.

